Perhaps they are learning from my neighbor children with their sidewalk chalk. Usually the utility workers with their spray cans are not so artistic. This is apparently a gas line access, since the gas company uses school bus yellow to mark their utility lines. Instead of the usual “X” or “+” depending on your perspective, this person added an extra crossbar. When slight depression left for the access plate was filled in with asphalt, the gritty, grainy black looked like sunflower seeds crowding the center of a sunflower, making the yellow crossbars look like petals.